The last three hidden screws are a !&&* of a time consumer to remove. probably you would need only a certain type of tweezers - I got stuck at midway and now I cannot get go have my phone detect the sim card either probably because the six screws are removed. I can now turn the phone back on but with no service or wifi connections are detected. This phone is a disaster!

in my phone the battery was glued with double sided adhesive tape, only on the right side. I pried the left side up first, and carefully removed the battery. to lift the battery I used first used a suction cup(?) followed by a plectrum like tool to lift te battery, and keep it lifted

A word of caution: the back panel is harder to remove than you might think. Especially because you may be removing the *screen* by mistake. When you have a "grip" with the tool make sure the metallic border is not coming off with it, and when you have removed enough to be able to lift the panel, make sure it isn't attached by ribbons - in that case you've been removing the screen. A good idea is to gently press your finger nail against the weak plastic located between the back and the SIM slot, and going up and down and sideways until you hear a click. Then you can start from there with the opening tool. As recommended be very gentle around the SIM slot.

There are several connectors to the motherboard. In the picture above, one connector above and, below the screw thread, three more connectors. Be careful to reconnect any connectors accidentally disconnected while disconnecting / removeing the battery. In my case the connector shown at the top of the row came unconnected.

Thanks Buddy, I replaced battery of my one plus one and when I switched it on, touch was not working. It was heart sinking panic moment...Then I came across https://forum.xda-developers.com/oneplus... post, simple trick of sliding piece of paper below battery solved and infact improved the touch response. Thanks !

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the digitizer ribbon connector has a small plastic piece that blocks the connector from being removed through the slit. make sure to remove it (simple push with an opening tool). then you can remove the connector/ribbon cable.

All the ribbons came off easily after I found them, save for the volume buttons. Iended up tearing the ribbon trying to maneuver it out with the motherboard itself. Do you guys have any tips for removing the volume control ribbons? They seem to be held down by tiny extrusions in the phone.

Another method for the side ribbons (power/volume) is desoldering the connectors - since I couldn't find any promising way to detach the buttons without damage I took this route and had success. Also note that you do not need to remove the mainboard and cameras for replacing the screen - a slight tilt should be enough to access the top ribbon (which belongs to the display assembly and has to be removed) so the side ribbons can stay in place.

I removed the side ribbon for the volume buttons is really easy by using the plastic tool between the two volume buttons in direction from up (backside of the phone) to down (screen of the phone). Trying to remove it from the volume down direction end of the cable almost destroyed the volume down button, so don’t try it

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After removing the final screw that holds the motherboard in place, do not just lift away the motherboard. The antenna is fixed to the back of the motherboard in the bottom right corner. Lift the motherboard from the top, leaving the bottom part of the motherboard (the part that is nearest the battery) close to the phone body. The antenna is a black wire that runs from the motherboard around the right side of the battery recess. It is held to the back side of the motherboard by a small, round, brass-coloured connector. It can be unclipped from the motherboard using a small pair of tweezers.

After my second assembly replacement I realised it is not necessary to completely remove the motherboard. Just lift it from the top enough to navigate the top ribbon on the assembly through the chassis and therefore avoid any possible damage to the power and volume flex.